Encyclopedia of radio electronics and electrical engineering / radio reception
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The receiver is assembled on 3 transistors according to the 1-V-2 direct amplification scheme. The input signal is amplified at high frequency by transistor VT1 and detected by transistor VT2. At a low frequency, amplification occurs on transistors VT2 and VT3. Resistor R2 is the volume control. The signal is tapped on a miniature earphone TM-2A.
The current in silent mode is set by resistor R1 and is 2,5 ... 2,7 mA. Transistors are applied with B>500. The radio does not have a power switch. When the phone plug is removed, the transistors are closed, and the circuit does not consume current.
The magnetic antenna is wound on a round or flat ferrite rod. Coil L1 contains about 200 turns of PELSHO wire 0,25 mm (outlet - from the 60th turn, counting from the lower end L1 according to the scheme). The winding is made in 4 sections of 50 turns. Coil L2 has 10 turns of 0,2 mm PEV wire and is located in the middle of the L1 coil sections. The connection of the ends of the coils and the number of turns is selected during tuning. The receiver is powered by a single element 316.
Author: A. Terentiev, Naberezhnye Chelny
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